My truck came with the stock air ride shitspension, which I enjoyed removing.
The 1st thing I did was install a 3" body lift. I also raised the bumpers and bought a thick rubber pickup truck bed liner and cut pieces out of it and attached them to the inner fender wells to hide the gap created from the body lift. With the rear bumper raised, the hitch looked weird being 3" below the bumper, so I removed the hitch and had a local welding shop, alter it so when I reattached it, it was 3" higher and looked normal again.
The 2nd thing I did was remove the rear bags and replaced them with springs from Strutmaster, which proved later to be a waste of time and money. The parts they deliver are OEM spec replacements ONLY, regardless of what they tell you on the phone.
Next I replaced the front air shocks with the biggest Monroe coil overs that I could get in there. It was a giant pain in the asteroid, but my god was it worth it.
At this point I ran 325 65 18 Terra Grapplers without rubbing. But, when it came time for new shoes, I wanted 37's like a fat kid wants cake.
So, I started out measuring the rear and trying to figure out which springs I needed to get my truck at the correct ride height. If I my truck was stock inside it would have been a lot easier. But, inside my truck is 11 BOXES of Dynamat. Each box contains 9 32"x24" sheets. If you've never held a full sheet, what you need to know is, that S&1t is HEAVY. Also, in the rear is a double 3/4" front baffled Sub box, 4 amps, and 2 deep cycle NorthStar batteries. So, with the oem replacement StrutMaster springs, the rear squated and sat lower than the front.
After figuring out the weight differences, jacking the rear up to where I needed it to be (using the hitch as the jack point), and making sure the shocks weren't gonna be over extended (which they were), I was ready to find what I needed.
The shocks were an easy find at O'Reilly and I went with 9000 Series Rancho. The Springs I needed were a different story. I had about 4 different companies tell me that I was going to have to get them custom built. Then a friend of mine who used to work for a muffer/brake chain store, asked me if I checked Moog's website. I had NOT. But I highly recommend that's where you go once you determine the size springs that you need.
Installed the springs, added 3" torsion keys up front, and the result is what's pictured.